Where are the embryos most likely to implant in an ectopic pregnancy?

The commonest site of ectopic pregnancy is in the Fallopian tube (75-96%). Approximately, 5% of ectopic pregnancies implant within the uterine wall but outside the uterine cavity and these include cornual ectopic, cervical and caesarean section scar ectopic pregnancies. Other less common sites include the ovary. Abdominal pregnancy is very rare, usually the fetus dies. However, occasionally it develops fully and survives, the delivery is performed by cutting the abdomen (laparotomy).

It is usual for the afterbirth (placenta) to be left over after the delivery of abdominal pregnancy, this is because it is usually fixed to the internal organs and removing it may results in damages to the these organs. These uncommon sites are very rarely encountered after natural conception compared to IVF pregnancies.

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